NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Polar cap magnetic variations and their relationship with the interplanetary magnetic sector structure.The relationship between polar geomagnetic variations and the polarity of the interplanetary magnetic sectors has been studied for the quiet year 1965. It is found that during the day hours a system of ionospheric currents encircles the magnetic poles on every day. The current system may extend up to 15 deg from the pole but is strongest at 8 to 10 deg invariant colatitude. The current direction as seen from near the magnetic poles is counterclockwise during interplanetary sectors with field pointing away from the sun and clockwise during toward sectors. The current strength is dependent on season, being strongest during local summer. When the magnetic pole is on the nightside of the earth, this polar cap current is absent or very weak.
Document ID
19730045157
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Svalgaard, L.
(Stanford University Stanford, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
May 1, 1973
Publication Information
Publication: Journal of Geophysical Research
Volume: 78
Subject Category
Geophysics
Report/Patent Number
AD-763329
Accession Number
73A29959
Funding Number(s)
CONTRACT_GRANT: N00014-67-A-0112-0068
CONTRACT_GRANT: NGR-05-020-559
CONTRACT_GRANT: NSF GA-31138
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available